CHECK YOUR UNDERSTANDING
Consider the roach. Why does its population size never reach its biotic potential?
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The concept of minimum viable population:
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Population density is:
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Groups of fish called blue tang swim in large schools around coral reefs in the ocean, while barracuda, a fierce, predatory fish, prowl the waters alone, looking for prey throughout the area. Regarding distribution:
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Exponential growth of a population:
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D. |
Carrying capacity, or K, is:
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WORK WITH IDEAS
Compare the reproductive strategy of a deer mouse with that of a bear.
Kangaroo rats eat seeds and are eaten by coyotes. Under what conditions might the kangaroo rat population increase exponentially? Logistically? Identify at least two factors that could lead to a decrease in the kangaroo rat population size.
Mountain gorillas live in extended families and search daily for favourite tree types that have tasty leaves. Contrast the population distribution of mountain gorillas with that of the trees they eat.
Lesser goldfinches are small, seed-eating birds. In cities, they are eaten by wild hawks and by domestic cats. Discuss several density-dependent and density-independent factors, including both critical factors and resistance factors, that could affect their carrying capacity.
Lemmings, the smallest mammal in the Arctic, feed on the roots, shoots, and blades of grasses. The stoat is a weasel that feeds exclusively on lemmings. Describe how these two populations undergo boom-and-bust cycle population fluctuations.
Ranchers in your area want to impose a bounty on wolves and mountain lions; they fear the predators are eating young calves. As a wildlife biologist, explain to the ranchers why this may or may not be a good idea.